Non-return valve for pumps and similar uses



G. B. PETSCHE. NON-RETURN VALVE FOR PUMPS AND SIMILAR USES.

APPLICATION nuzu NOV. 2, 1920.

1,397,700. Patented Nov. .22, 1921.

INVENTOR A TTORNE Y FICE.

GUSTAV B. PETSCEE, 43F YUNKEBS, NEW YORK.

NON-RETURN VALVE FOR PUMPS AND SIMILAR USES.

Application filed November 2, 1920.

To all whom it may concern:

Be it known that l, Gusrav B. Parsons a citizen of the United States of America, and resident of Yonkers, in the county of ll estchester, in the State or" New York, have invented a certain new and useful lmprovcment in Non- Return Valves for Pumps and Similar Uses, of which the following is a true and exact description, reference being had to the accompanying drawings, which form a part thereof.

My invention relates to non-return valves and is particularly, though not exclusively, adapted for use in connection with roti eccentric ring piston pumps and especially adapted in connection with such pumps to serve as their discharge valves. The object of my invention is to provide a valve and valve casing in which the valve will seat itself on the pump port and open to permit the How of fluid through such port in accordance with the pressure or flow of the fluid and which valve and casing will be of simple construction, not liable to get out of order and so constructed that the valve will open and close without pounding or noise. M r construction also provides for the ready insertion or removal of the valve from its casingand is especially valuable for use in connection with rotary eccentric ring piston pumps used as air pumps in connection with a. condenser.

The nature of my improvements will be best understood as described in connection with the drawings in which they are illustrated and in which Figure l is a sectional elevation through one side of a double eccentric ring piston. pump provided with my valve taken on the line 1-1 of Fig. 2.

Fig. 2 is a side elevation of the pump shown partly in section on the line 2-2 of Fig. 1.

F ig. 3 is an enlarged sectional view of the valve taken as on the section line 3-3 of Fig. 1.

F ig. 4, a cross sectional view of the valve on the line 4& of Fig. 3.

F ig. 5 is a sectional View showing a modified arrangement'of valves and valve chambers.

Fig. 6 is a side elevation of a modified form of valve, and

Fig. 7 an end view of the valve shown in Fig. 6.

A and A indicate two rotary pump cyl- Specification of Letters Patent.

Patented Nov. 22,

Serial No. 421,223.

inders formed in a single casting their outer sides being closed by the face plates A and B indicates the cylindrical periphery of the pump cylinder, 13 and B being the points where the periphery of the cylinder is cut away to give clearance for the piston extension. C is a cylindrical bearing for the swivel block indicated at K. D is the admission chamber of the pump which serves as admission chamber for both of the pair of pumps and is supplied through the portion indicated at D. E is the discharge port of the pump located in close proximity to the point B of the cylinder. ()n the delivery side of this port formed integral with the pump wall in which the port is formed is a cylindrical valve chamber F having openings F at its ends extending through the side walls of the pump and closed by plugs F. The discharge port E opening into the valve casing is made long and narrow and the cylindrical valve casing is also long and narrow but of greater length than the discharge port, on each end of which discharge port the casing has bearing sur faces indicated at F l" and F are exit ports from the valve facing F which are also preferably long and narrow and formed in diiierent planes. L is a long and narrow cylindrical valve of smaller diameter than that of the casing l and preferably formed of some yielding and elastic material such as hard rubber or a tubular metal valve as indicated at L. in. Figs. 6 and '7 may be used. The valve is of greater length than the length of the discharge port going into the alve casing. G indicates the discharge chamber of the pump into which the exit passages F. F open. G is the opening through which the fluid. is delivered from the chamber G and, as shown. the bottom 9 of this opening is at such a height that the lower part of the chamber will serve as a liquid receptacle holding the liquid at a level which would keep the valve chamber submerged. H is the driving shaft of the pump to which is secured eccentrics H, H, which have the eccentric ring pistons indicated at I, these pistons being formed with an extension 1 serving as a partition between the admission and dischar e valve of the pump and in the construction shown extending through the swivel block K into the admission chamber D. As shown, the piston extension has an opening J formed in it opening into the chamber D and openopenings ers.

ing into J at the admission side of the pump the port J being so located that during the period when the piston is moving from point B to the pointB and is out of contact with the periphery of the pump cylinder the port 5' will be closedby a porion K of th swivel block Kl In the construction shown in Fig. 5 the delivery port E is formed with two branch E, E, each provided with separate valve and valve chamber L and L. This duplication of the valve chambers may be advisable where the pump is run at exceedingly high speed and for the purpose of reducing the lift of the valves.

in operation the fluid enters through the passage D into chamber D passing through t 1e passage J and port 5 into the admission side of the pump cylinder and from the pump cylinder it passes through the long and narrow port E .into the long and narrow cylindrical valve chamber F, the valve L under the influence of the fluid issuing through the port leaving its seat and passing directly with a rolling motion to the upper part of the valve casing. During the delivery stroke of the pump the valve cannot at the same time cover or close both ports F and F It may, of course, close either one of these ports or it may during the delivery stroke take a position between the ports as indicated in Fig. 4:. At the end of the delivery stroke of the pump the back flow of the fluid causes the valve to re-seat itself on the delivery port.

It is preferable that the valve L should be made of a yielding and elastic material such as hard rubber or a light metal tube but a valve of unyielding material may also be used.

I have designed the valve above de scribed particularly with reference to its use of the rotary pump used to remove the air and water simultaneously from condens- T his use calls for an alternately opened and closed inlet port of liberal size to secure the aspiration of a full cylinder displacement with every revolution of the pump and, in connection with the pump having this construction I desi n to )rovide an auv tomatically operating outlet valve of unusually simple construction yet one which will be cheap to maintain and readily examined or replaced, and it will readily be seen that the valve construction specified complies I with all these desirable conditions, notably because, in addition to its other qualities, the valve construction is such that it is constantly shifting its position so that its entire surface is made available for wear instead of wearing only in one place as would be the case if it always seated itself in the same position which is the case with common disk valves.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A non-return valve comprising a long and narrow cylindrical valve chamber having a long and narrow port leading into'it, and a plurality of long and narrow exit ports lying in different planes, in combination with a long and narrow cylindrical valve of less diameter than the valve chamber and of a length greater than that of the inlet port.

2. A non-return valve comprising a long and narrow cylindrical valve chamber having a long and narrow port leading into it and a plurality of long and narrow exit ports lying in different planes, said valve chamber having an end opening for the introduction of the valve, in eombinationwith a long and narrow cylindrical valve of less diameter than the valve chamber and of a length greater than that of the inlet port and means for closing the open end of the valve chamber.

3. A non-return valve comprising a long and narrow cylindrical valve chamber hav ing a long and narrow port leading into it and a plurality of long and narrow exit ports lying in different planes, in combination with a long and narrow cylindrical valve of less diameter than the valve chamber and of a length greater than that of the inlet port, said valve being made of a yielding elastic material.

GUSTAV B. PETSCHE. 

